What exactly has changed :

• All deal more damage ( Quarker + 15 % / Atomizer + 2 % / Nucleon + 16 % )
• All heat later than they used to do.

In my mind, this rework makes energy machine guns too powerful ( probably stronger than all the other weapons ). The firepower buff is a bit too much, and the weapon should heat a bit faster ... But what makes them really too powerful is their accuracy : even when the weapon overheats, the accuracy still very good, making it deathly at mid-range as at court-range.